Description : They were granted patents for scanning and transmitting television images through uncoated fiber cables
Last Answer : Baird and Hansel
Description : It is the thermal noise power normalized to 1- Hz bandwidth:
Last Answer : noise power density
Description : When microwave energy is passed through a piece of ferrite in a magnetic field, another effect occurs. If the frequency of the microwave energy is much greater than the electron wobble frequency, the plane of polarization of the wavefront is rotated. This is known as
Last Answer : Faraday Rotation Effect
Description : The width of the vertical sync pulse in the Philippine TV system is
Last Answer : 3H
Description : ______ are special-interest groups that quickly test, evaluate, and standardize new technologies
Last Answer : Forums
Description : A class A FM station is limited in antenna height of ______ feet above average terrain.
Last Answer : 2000
Description : The service are in standard AM broadcast is described as ______ if there is no fading of signal.
Last Answer : Primary
Description : The final power amplifier in an FM transmitter usually operates class ______.
Last Answer : C
Description : The time it takes to transmit one TDM frame is called ______
Last Answer : Frame time
Description : In a ______ handoff, a mobile station can communicate with two base stations at the same time
Last Answer : . soft
Description : In a ______ handoff, a mobile station only communicates with one base station
Last Answer : hard
Description : One of the responsibilities of the transport layer protocol is to create a ______ communication.
Last Answer : process to process
Description : A special type of transmission line that consist of conducting metallic tube through which high frequency electromagnetic energy is propagated
Last Answer : waveguide
Description : In a waveguide, what is a frequency that would cause angles of incidence and reflection to be zero degrees?
Last Answer : Critical Frequency
Description : At what frequency compared to the cutoff frequency of a waveguide will the wavefronts be reflected back and forth across the guide (setting up standing waves) and no energy
Last Answer : UHF receiving antenna
Description : In changing the frequency of a cavity, what is accomplished by placing a nonmagnetic slug in the area of maximum H lines
Last Answer : Inductive Coupling
Description : In the Philippine color television system, the intercarrier frequency, in MHz, is
Last Answer : 4.5
Description : Which circuit is most common to both frequency-hopping and direct-sequence spread spectrum transmitters?
Last Answer : PSN code generator
Description : The result whenever the sampling rate is less than twice the highest audio frequency.
Last Answer : alias
Description : An FDM hierarchy which is formed by frequency – division multiplexing 10 super groups together for a combined capacity of 600 voice band message channels.
Last Answer : Mastergroup
Description : An FDM hierarchy which is formed by frequency – division multiplexing five groups containing 12 channels each for a combined bandwidth of 240 kHz
Last Answer : Supergroup
Description : “When visible light of high frequency electromagnetic radiation illuminates a metallic surface, electrons are emitted”
Last Answer : Plank’s law
Description : What is the frequency limit of a copper wire?
Last Answer : approximately 1.0 MHz
Description : In communication systems the frequency range used for voice is:
Last Answer : 300 Hz to 3800 Hz
Description : The best frequency demodulator is the:
Last Answer : PLL discriminato
Description : Approximately what is the frequency limit of the optical fiber?
Last Answer : 40 GHz
Description : The magnetic field of an antenna is perpendicular to the earth. The antenna’s polarization ___
Last Answer : is horizontal
Description : Plots of field strength or power density with respect to the value at a reference point.
Last Answer : relative radiation pattern
Description : The radiation pattern plotted in terms of electric field strength or power density
Last Answer : absolute radiation pattern
Description : A mode where the entire magnetic field is in the transverse plane and has no portion parallel to the length axis.
Last Answer : TM mode
Description : In IPv6, when a datagram needs to be discarded in a congested network, the decision is based on the _______ field in the base header.
Last Answer : priority
Description : In IPv4, what is the value of the total length field in bytes if the header is 28 bytes and the data field is 400 bytes?
Last Answer : 428
Description : A car having a mass of 1000 kg deflects its springs 4 cm under its load. Determine the natural frequency of the car in vertical direction. A 5 Hz B 4.67 Hz C 9.8 Hz D 2.49 Hz
Last Answer : D 2.49 Hz
Description : A car having a mass of 1000 kg deflects its springs 4 cm under its load. Determine the natural frequency of the car in vertical direction. A 5 HzB 4.67 Hz C 9.8 Hz D 2.49 Hz
Description : A car having a mass of 1000 kg deflects its springs 4 cm under its load. D Determine the natural frequency of the car in vertical direction. (A)5 Hz (B) 4.67 Hz (C) 9.8 Hz (D) 2.49 Hz
Last Answer : (D) 2.49 Hz
Description : Sound of frequency below 20 Hz is called ______.
Last Answer : Infrasonic
Description : Sound of frequency below 20 Hz is called ______. (1) audio sounds (2) infrasonic (3) ultrasonic (4) supersonics
Last Answer : (2) infrasonic Explanation: The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound and nominally includes anything under 20 Hz.
Description : A carrier signal has ______. A. Constant peak amplitude B. The information C. Frequency range 20-20000 Hz D. A varying amplitude
Last Answer : A. Constant peak amplitude
Description : The frequency of a wave travelling at a speed of 500 ms-1 is 25 Hz. Its time period will be ______. (i) 20 s (ii) 0.05 s (iii) 25 s (iv) 0.04 s
Last Answer : (iv) 0.04 s
Description : Define following with respect to television: (i) Aspect ratio (ii) Vertical & Horizontal Resolution (iii) Interlace scanning (iv) Image continuity
Last Answer : (i) Aspect ratio: The aspect ratio of an image describes the proportional relationship between its width and its height. The frame adopted in all television systems is rectangular with width/height ratio ... (mix) the changing levels of brightness in the scene. This is called as Image Continuity.
Description : It is the ratio of the power density radiated in a particular direction to the power density radiated to the same point by a reference antenna, assuming both antennas are radiating the same amount of power
Last Answer : directive gain
Description : The property of interchangeability for the transmitting and receiving operations is known as ____
Last Answer : reciprocity
Description : The fields surrounding the antenna do not collapse their energy back into the antenna but rather radiate it out in space
Last Answer : radiation field
Description : It is the ratio of the radiated to the reflected energy:
Last Answer : Radiation efficiency
Description : It is the resistance that, if it replaced the antenna, would dissipate exactly the same amount of power that the antenna radiates
Last Answer : . Radiation resistance
Description : The line bisecting the major lobe, or pointing from the center of the antenna in the direction of maximum radiation is called _____
Last Answer : line of shoot
Description : If energy is applied at the geometrical center of antenna, the antenna is said to be ___
Last Answer : center-fed